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The lumbar seats had a different pump than the standard seats.
You've noted the second port for the seats.
If you wanted to defeat the seats, a standard pump should restore the locking function. I've found the lumbar option to be quite rare, and unreliable as the system ages. The bladders get leaks in them, causing the pump to run more often.
Contrary to earlier vacuum systems, the W124 uses a negative and positive pressure to actuate a single diaphragm, vice the older style of having vacuum ports on both sides of the diaphragm.
W126 cars should have a similar pump to the W124.
Again, the hard (expensive) part will be to find a two port pump....
Jim
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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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